ath9k_hw: Fix calculation of PAPRD training power at 5Ghz

higher the chainmask, lesser the power_delta to be added
to the paprd_training_power
Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ar9003_paprd.c

@@ -83,7 +83,23 @@ static int ar9003_get_training_power_5g(struct ath_hw *ah)
 	if (delta > scale)
 		return -1;
 
-	power += 2 * get_streams(common->tx_chainmask);
+	switch (get_streams(common->tx_chainmask)) {
+	case 1:
+		delta = 6;
+		break;
+	case 2:
+		delta = 4;
+		break;
+	case 3:
+		delta = 2;
+		break;
+	default:
+		delta = 0;
+		ath_dbg(common, ATH_DBG_CALIBRATE,
+		"Invalid tx-chainmask: %u\n", common->tx_chainmask);
+	}
+
+	power += delta;
 	return power;
 }